5 Ounce ATB's 2010 Two 70's Three 69's

I have 8 ATB's 5 ounce coins that I purchased from the Mint. I decided to take the chance to get them graded. For the first 5 from 2010 series I got back two 70's and 3 69's. I look at the coin and thought they were all 70's...what the hell the US Mint takes very special handling in the coins so I figured they should rate high. Well they did not and I would like to know why. I wish NGC would tell why your coin graded the way it did so I know what to look for next time. Could have been all 68's so I guess I doing well.

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